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• 10:08

### Ideal Gas Equation Example 1

/ 168 views

Figuring out the number of moles of gas we have using the ideal gas equation: PV=nRT. More free lessons at: http://www.khanacademy.org/video?v=erjMiErRgSQ

• 09:22

### Ideal Gas Equation: PV=nRT

/ 190 views

Intuition behind the ideal gas equation: PV=nRT. More free lessons at: http://www.khanacademy.org/video?v=WScwPIPqZa0

• 15:04

### Stoichiometry: Limiting Reagent

/ 140 views

Stoichiometry problem where we have a limiting reagent! More free lessons at: http://www.khanacademy.org/video?v=rESzyhPOJ7I

• 09:56

### Stoichiometry

/ 175 views

Introduction to stoichiometry More free lessons at: http://www.khanacademy.org/video?v=SjQG3rKSZUQ

• 14:28

### Balancing Chemical Equations

/ 173 views

The art of balancing equations in chemistry! More free lessons at: http://www.khanacademy.org/video?v=RnGu3xO2h74

• 06:41

### Another mass composition problem

/ 148 views

Another exercise converting a mass composition to an empirical formula. More free lessons at: http://www.khanacademy.org/video?v=sXOIIEZh6qg

• 12:58

### Formula from Mass Composition

/ 162 views

Figuring out the empirical formula from a molecules mass composition

• 09:44

### The Mole and Avogadro's Number

/ 187 views

Introduction to the idea of a mole as a number (vs. an animal) More free lessons at: http://www.khanacademy.org/video?v=AsqEkF7hcII

• 15:54

### Molecular and Empirical Formulas

/ 164 views

Introduction to molecular and empirical formulas. Calculating molecular mass. More free lessons at: http://www.khanacademy.org/video?v=gfBcM3uvWfs

• 13:22

### Ionic, Covalent, and Metallic Bonds

/ 167 views

Introduction to ionic, covalent, polar covalent and metallic bonds. More free lessons at: http://www.khanacademy.org/video?v=CGA8sRwqIFg

• 15:39

### Other Periodic Table Trends

/ 161 views

Electronegativity, metallic nature and atomic radius.

• 12:13

### Periodic Table Trends: Ionization Energy

/ 175 views

What an ion is. Using the periodic table to understand how difficult it is to ionize an atom. More free lessons at: http://www.khanacademy.org/video?v=ywqg9PorTAw

• 11:51

### Groups of the Periodic Table

/ 185 views

Properties of alkali, alkaline earth and transition metals. Halogens and noble gases. More free lessons at: http://www.khanacademy.org/video?v=LDHg7Vgzses

• 15:23

### Valence Electrons

/ 115 views

Looking at valence electrons to figure out reactivity More free lessons at: http://www.khanacademy.org/video?v=1TZA171yxY4

• 10:18

### Electron Configurations 2

/ 149 views

Figuring out configurations for the d-block elements More free lessons at: http://www.khanacademy.org/video?v=YURReI6OJsg

• 10:05

### Electron Configurations

/ 169 views

Introduction to using the periodic table to determine electron configurations

• 14:31

### More on orbitals and electron configuration

/ 134 views

More intuition on orbitals. Touching on electron configuration. More free lessons at: http://www.khanacademy.org/video?v=FmQoSenbtnU

• 13:38

### Orbitals

/ 123 views

An introduction to orbitals More free lessons at: http://www.khanacademy.org/video?v=yBrp8uvNAhI

• 21:05

### Introduction to the atom

/ 162 views

The atom, proton, neutron and electron More free lessons at: http://www.khanacademy.org/video?v=1xSQlwWGT8M

• 12:41

### Taxonomy and the Tree of Life

/ 222 views

The science of taxonomy and where humans fit into the tree of life More free lessons at: http://www.khanacademy.org/video?v=oHvLlS_Sc54

• 08:49

### Species

/ 194 views

What a species is and isn't. Ligers, tiglons, mule, hinnies, and dogs More free lessons at: http://www.khanacademy.org/video?v=Tmt4zrDK3dA

• 14:13

### Secondary Active Transport in the Nephron

/ 147 views

Secondary Active Transport in the Nephron More free lessons at: http://www.khanacademy.org/video?v=czY5nyvZ7cU

• 14:35

### Inflammatory Response

/ 151 views

Overview of the inflammatory response More free lessons at: http://www.khanacademy.org/video?v=FXSuEIMrPQk

• 11:07

### Review of B cells, CD4+ T cells and CD8+ T cells

/ 196 views

Review of B cells, CD4+ T cells and CD8+ T cells More free lessons at: http://www.khanacademy.org/video?v=xaz5ftvZCyI

• 10:07

### Cytotoxic T Cells

/ 156 views

How cytotoxic T cells get activated by MHC-I/antigen complexes and then proceed to kill infected cells More free lessons at: http://www.khanacademy.org/video?v=oqI4skjr6lQ

• 20:34

### Helper T Cells

/ 176 views

Introduction to helper T cells and their role in activating B cells More free lessons at: http://www.khanacademy.org/video?v=uwMYpTYsNZM

• 11:33

### Professional Antigen Presenting Cells (APC) and MHC II complexes

/ 204 views

How professional antigen presenting cells present parts of engulfed pathogens on MHC II complexes (major histocompatibility complexes). More free lessons at: http://www.khanacademy.org/video?v=j_kSmmEpvQk

• 14:13

### B Lymphocytes (B cells)

/ 200 views

Overview of B cells (B lymphocytes) and how they are activated and produce antibodies More free lessons at: http://www.khanacademy.org/video?v=Z36dUduOk1Y

• 08:07

### Types of immune responses: Innate and Adaptive. Humoral vs. Cell-Mediated

/ 216 views

Overview of types of immune responses. Difference between innate and adaptive immunity. Differences between humoral adaptive immunity and cell-mediated adaptive immunity. More free lessons at: http://www.khanacademy.org/video?v=rp7T4IItbtM

• 16:20

### Role of Phagocytes in Innate or Nonspecific Immunity

/ 194 views

Role of phagocytes in innate or nonspecific immunity. Neutrophils, macrophages, and dendritic cells. MHC II. More free lessons at: http://www.khanacademy.org/video?v=O1N2rENXq_Y

• 16:32

### Anatomy of a muscle cell

/ 194 views

Understanding the structure of a muscle cell More free lessons at: http://www.khanacademy.org/video?v=uY2ZOsCnXIA

• 14:43

### Role of the Sarcoplasmic Reticulum in Muscle Cells

/ 573 views

The role of the sarcoplasmic reticulum in controlling calcium ion concentrations within the muscle cell More free lessons at: http://www.khanacademy.org/video?v=SauhB2fYQkM

Featured
• 09:22

### Tropomyosin and troponin and their role in regulating muscle contraction

/ 200 views

Tropomyosin and troponin and their role in regulating muscle contraction. How calcium ion concentration dictates whether a muscle is contracting or not. More free lessons at: http://www.khanacademy.org/video?v=LiOfeSsjrB8

• 09:38

### Myosin and Actin

/ 159 views

How myosin and actin interact to produce mechanical force. More free lessons at: http://www.khanacademy.org/video?v=zopoN2i7ALQ

• 15:54

### Neuronal Synapses (Chemical)

/ 175 views

How one neuron can stimulate (or inhibit) another neuron at a chemical synapse More free lessons at: http://www.khanacademy.org/video?v=Tbq-KZaXiL4

• 18:53

### Electrotonic and Action Potentials

/ 172 views

How electrotonic and action potentials propagate down cells

• 06:48

### Correction to Sodium and Potassium Pump Video

/ 211 views

Correction to Sodium and Potassium Pump Video More free lessons at: http://www.khanacademy.org/video?v=ye3rTjLCvAU

• 13:53

### Sodium Potassium Pump

/ 158 views

How a sodium potassium pump can maintain a voltage gradient across a cell or neuron's membrane More free lessons at: http://www.khanacademy.org/video?v=C_H-ONQFjpQ

• 06:13

### Anatomy of a Neuron

/ 355 views

Introduction to the neuron and its anatomy More free lessons at: http://www.khanacademy.org/video?v=ob5U8zPbAX4

• 14:34

### Hemoglobin

/ 178 views

Hemoglobin and its role in the circulatory system More free lessons at: http://www.khanacademy.org/video?v=LWtXthfG9_M

• 14:57

### Circulatory System and the Heart

/ 315 views

Introduction to the circulatory system and the heart More free lessons at: http://www.khanacademy.org/video?v=QhiVnFvshZg

• 16:30

### Red blood cells

/ 211 views

Oxygen uptake by hemoglobin in red blood cells More free lessons at: http://www.khanacademy.org/video?v=fLKOBQ6cZHA

• 20:33

### The Lungs and Pulmonary System

/ 185 views

The pulmonary system including the lungs, larynx, trachea, bronchi, bronchioles, alveoli and thoracic diaphragm More free lessons at: http://www.khanacademy.org/video?v=SPGRkexI_cs

• 21:04

### Parts of a cell

/ 160 views

Parts of a cell: nucleus, ribosomes, endoplasmic reticulum, Golgi bodies, mitochondria, chloroplasts, vacuoles, and vesicles

• 08:37

### CAM Plants

/ 177 views

How CAM Plants are able to fix carbon at night so they don't have to keep their stomata open during the day More free lessons at: http://www.khanacademy.org/video?v=xp6Zj24h8uA

• 16:58

### C-4 Photosynthesis

/ 224 views

C-4 Photosynthesis: How some plants avoid photorespiration More free lessons at: http://www.khanacademy.org/video?v=7ynX_F-SwNY

• 17:03 Popular

### Photorespiration

/ 1,689 views

More detail on the Calvin Cycle and Photorespiration More free lessons at: http://www.khanacademy.org/video?v=EQvTEFCANTM

• 13:28

### Photosynthesis: Calvin Cycle

/ 200 views

The Calvin Cycle or the light-independent (dark) reactions of photosythesis More free lessons at: http://www.khanacademy.org/video?v=slm6D2VEXYs

• 18:51

### Photosynthesis: Light Reactions and Photophosphorylation

/ 188 views

More detail on the light reactions and photophorylation More free lessons at: http://www.khanacademy.org/video?v=yfR36PMWegg

• 20:16

### Photosynthesis: Light Reactions 1

/ 190 views

Details on the light-dependent reactions of photosynthesis More free lessons at: http://www.khanacademy.org/video?v=GR2GA7chA_c

• 13:38

### Photosynthesis

/ 212 views

Overview of photosythesis More free lessons at: http://www.khanacademy.org/video?v=-rsYk4eCKnA

• 04:59

### Oxidative Phosphorylation and Chemiosmosis

/ 170 views

Oxidative Phosphorylation and Chemiosmosis (along with slight correction of previous video) More free lessons at: http://www.khanacademy.org/video?v=W_Q17tqw_7A

• 17:16

### Electron Transport Chain

/ 186 views

Overview of the Electron Transport Chain More free lessons at: http://www.khanacademy.org/video?v=mfgCcFXUZRk

• 17:47

### Krebs / Citric Acid Cycle

/ 185 views

Overview of the Krebs or Citric Acid Cycle More free lessons at: http://www.khanacademy.org/video?v=juM2ROSLWfw

• 13:30

### Glycolysis

/ 150 views

Overview of glycolysis More free lessons at: http://www.khanacademy.org/video?v=FE2jfTXAJHg

• 17:08

### Oxidation and Reduction in Cellular Respiration

/ 156 views

Oxidation and reduction in cellular respiration. Reconciling the biology and chemistry definitions of oxidation and reduction. More free lessons at: http://www.khanacademy.org/video?v=_KyyVhlUDNU

• 13:29

### Oxidation and Reduction Review From Biological Point-of-View

/ 158 views

Taking a looking at oxidation and reduction in a biological context More free lessons at: http://www.khanacademy.org/video?v=orI2m6IarJg

• 14:19

### Introduction to Cellular Respiration

/ 168 views

Introduction to cellular respiration, glycolysis, the Kreb's Cycle, and the electron transport chain

• 13:35

/ 320 views

Introduction to ATP or Adenosine Triphosphate

• 23:17

### Viruses

/ 140 views

Introduction to viruses More free lessons at: http://www.khanacademy.org/video?v=0h5Jd7sgQWY

• 18:27

### Bacteria

/ 195 views

Introduction to bacteria More free lessons at: http://www.khanacademy.org/video?v=TDoGrbpJJ14

• 14:19

/ 391 views

• 14:57

### Hardy-Weinberg Principle

/ 182 views

Understanding allele and genotype frequency in population in Hardy-Weinberg Equilibrium.

• 25:16

### Punnett Square Fun

/ 207 views

Dihybrid crosses. Independent assortment. Incomplete dominance. Codominance and multiple alleles. More free lessons at: http://www.khanacademy.org/video?v=D5ymMYcLtv0

• 17:27

### Introduction to Heredity

/ 169 views

Heredity and Classical Genetics. Dominant and recessive traits. Heterozygous and homozygous genotypes. More free lessons at: http://www.khanacademy.org/video?v=eEUvRrhmcxM

• 12:36

### Cancer

/ 299 views

An introduction to what cancer is and how it is the by-product of broken DNA replication More free lessons at: http://www.khanacademy.org/video?v=RZhL7LDPk8w

• 19:55

### Embryonic Stem Cells

/ 178 views

An overview of early development of a zygote to an embryo. Embryonic and somatic stem cells. More free lessons at: http://www.khanacademy.org/video?v=-yCIMk1x0Pk

• 27:23

### Phases of Meiosis

/ 192 views

The phases of Meiosis. More free lessons at: http://www.khanacademy.org/video?v=ijLc52LmFQg

• 20:42

### Phases of Mitosis

/ 157 views

Explanation of the phases of mitosis. More free lessons at: http://www.khanacademy.org/video?v=LLKX_4DHE3I

• 18:24

### Mitosis, Meiosis and Sexual Reproduction

/ 176 views

Mitosis, meiosis and sexual reproduction. Understanding gametes, zygotes, and haploid / diploid numbers.

• 18:23

### Chromosomes, Chromatids, Chromatin, etc.

/ 172 views

The vocabulary of DNA: chromosomes, chromatids, chromatin, transcription, translation, and replication More free lessons at: http://www.khanacademy.org/video?v=s9HPNwXd9fk

• 19:52

### Variation in a Species

/ 158 views

How variation can be introduced into a species. More free lessons at: http://www.khanacademy.org/video?v=DuArVnT1i-E

• 28:06

### DNA

/ 176 views

An introduction to DNA More free lessons at: http://www.khanacademy.org/video?v=_-vZ_g7K6P0

• 13:29

### Natural Selection and the Owl Butterfly

/ 221 views

How the "Owl Butterfly" may have gotten the spot on its wings. More free lessons at: http://www.khanacademy.org/video?v=dR_BFmDMRaI

• 09:01

### Evolution Clarification

/ 177 views

Clarifying some points on evolution and intelligent design More free lessons at: http://www.khanacademy.org/video?v=nh1R-gyY7es

• 11:36

### Intelligent Design and Evolution

/ 184 views

The argument that evolution speaks to being the most "intelligent design" More free lessons at: http://www.khanacademy.org/video?v=qxOEz9aPZNY

• 01:04

### Ape Clarification

/ 142 views

Ape Clarification - that they have no tails More free lessons at: http://www.khanacademy.org/video?v=oFGkYA_diDA

• 17:39

### Introduction to Evolution and Natural Selection

/ 181 views

Introduction to evolution, variation in a population and natural selection More free lessons at: http://www.khanacademy.org/video?v=GcjgWov7mTM

• 12:09

### Surveys and Samples

/ 212 views

Surveys and Samples

• 09:58

### Two more examples of solving rational equations

/ 229 views

Two more examples of solving rational equations

• 12:57

### Solving Rational Equations

/ 190 views

Solving Rational Equations

• 06:24

/ 214 views

• 06:40

/ 241 views

• 03:47

/ 234 views

• 09:19

### Multiplying and Dividing Rational Expressions

/ 208 views

Multiplying and Dividing Rational Expressions

• 15:23

### Simplifying Rational Expressions Introduction

/ 200 views

Simplifying Rational Expressions More free lessons at: http://www.khanacademy.org/video?v=7Uos1ED3KHI

• 12:09

### Polynomial Division

/ 221 views

Polynomial Division More free lessons at: http://www.khanacademy.org/video?v=FXgV9ySNusc

• 11:31

### A Third Example of Graphing a Rational Function

/ 210 views

A Third Example of Graphing a Rational Function More free lessons at: http://www.khanacademy.org/video?v=p7ycTWq6BFk

• 08:20

### Another Rational Function Graph Example

/ 215 views

Another Rational Function Graph Example More free lessons at: http://www.khanacademy.org/video?v=ReEMqdZEEX0

• 21:06

### Asymptotes of Rational Functions

/ 214 views

Asymptotes of Rational Functions More free lessons at: http://www.khanacademy.org/video?v=2N62v_63SBo

• 17:03

### Proportionality

/ 210 views

Proportionality

• 13:14

### Box-and-whisker Plot

/ 311 views

Box-and-whisker Plot

• 06:08

/ 286 views

• 06:45

### Stem and Leaf Plots

/ 234 views

Stem and Leaf Plots

• 12:34

### Range, Variance and Standard Deviation as Measures of Dispersion

/ 251 views

Range, Variance and Standard Deviation as Measures of Dispersion More free lessons at: http://www.khanacademy.org/video?v=E4HAYd0QnRc

• 09:01

### Average or Central Tendency: Arithmetic Mean, Median, and Mode

/ 295 views

Average or Central Tendency: Arithmetic Mean, Median, and Mode

• 08:50

### Visual Pythagorean Theorem Proof

/ 280 views

Visual Pythagorean Theorem Proof - some basic geometry required

• 06:41

### Midpoint Formula

/ 246 views

Midpoint Formula More free lessons at: http://www.khanacademy.org/video?v=Ez_-RwV9WVo

• 09:39

### Distance Formula

/ 244 views

How to find the distance between lines using the Pythagorean Formula More free lessons at: http://www.khanacademy.org/video?v=nyZuite17Pc

• 13:03

### Pythagorean Theorem

/ 280 views

Pythagorean Theorem More free lessons at: http://www.khanacademy.org/video?v=AEIzy1kNRqo

• 11:54

/ 194 views